The Ecco Drive power source is light. Sunlight being the best source but this watch will tell you what amount of “light” power your existing environment is giving you. At full power it can be left in darkness for up to 2 years. It actually goes into a shutdown mode when idle to conserve energy. (They may of learn this from the Tissot T-Touch Professional Solar Watch).

It can receive a GPS reception from any of the 4 satellites above, as quickly as 3 seconds and as long as 2 minutes).

Not receiving a GPS signal? Another button preforms a radio communication with the antenna in Colorado.